Can't reuse an exisiting native mongo instance

[Mohamed-kamel91]

hi,
I am trying to connect express session to my native mongo store by reusing the existing mongo client instance, but no matter how much i try, it never seem to work at all.
when i run my app , i always end up with this error

Assertion failed: You must provide either mongoUrl|clientPromise|client in options
Error: Cannot init client. Please provide correct options
at new MongoStore (D:\code\clients\development\Trendy-Toys\server\node_modules\connect-mongo\src\lib\MongoStore.ts:196:13)
at Function.create (D:\code\clients\development\Trendy-Toys\server\node_modules\connect-mongo\src\lib\MongoStore.ts:214:12)
at Object. (D:\code\clients\development\Trendy-Toys\server\src\config\sessionStore.ts:11:33)
at Module._compile (internal/modules/cjs/loader.js:1063:30)
at Module.m._compile (D:\code\clients\development\Trendy-Toys\server\node_modules\ts-node\src\index.ts:1371:23)
at Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
at Object.require.extensions. [as .ts] (D:\code\clients\development\Trendy-Toys\server\node_modules\ts-node\src\index.ts:1374:12)
at Module.load (internal/modules/cjs/loader.js:928:32)
at Function.Module._load (internal/modules/cjs/loader.js:769:14)
at Module.require (internal/modules/cjs/loader.js:952:19)

This my express session in app.js file:

import sessionStore from './config/sessionStore';

const sessionOptions = {
  secret: env.SESSION_SECRET,
  resave: false,
  saveUninitialized: true,
  store: sessionStore,
  cookie: {
    secure: false,
    name: "session_id",
    sameSite: false,
    httpOnly: true,
    maxAge:  10 * 1000,
  },
};

// set express session store
app.use(session(sessionOptions));

This is sessionStore file:
I am importing my mongodb instance from a seperate file

import MongoStore from 'connect-mongo';
import env from '.';
import { client } from '../database/db';

const sessionStore = MongoStore.create({
  client,
  collectionName: "sessions",
});

export default sessionStore;

versions:

• express: 4.17.1
• express-session": 1.17.3
• connect-mongo: 4.6.0
• mongodb: 4.1.1

I'd apprecite if anyone can help me with this issue. Thanks